I was recently working with the Microsoft.SystemCenter.WebApplication.UrlProbe module and wanted to know exactly what I could pass through an expression filter and potentially include in an alert description. It’s easy enough to get this after creating a monitor and simulating the workflow, but sometimes this information is needed while authoring new composites/types. Of course, this is before any opportunity to simulate the monitoring workflow.

So, just as a reference, I am posting this runtime data here. Maybe it will help others in the future.